From: "Mike Dennison" <mike.dennison@rsgb.org.uk>
To: rsgb_lf_group@blacksheep.org
Date: Wed, 11 Apr 2001 12:46:48 +0100
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Subject: LF: Wolf - IK5ZPV not received
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M0BMU wrote:
> I made 3 recordings of IK5ZPV's "Wolf"  signals on 137.5kHz last 
> night; one made between 2000 and 2025utc produced no decoded 
> results, however the other 2, from between 2100 and 2200, both 
> decoded without problems after the 2nd and 3rd data frames 
> respectively.

I also made two recordings but failed to decode either. In both cases the pm 
figure was zero, and the f was 0.980, whatever setting I used for -r and -f. I 
am fairly sure this means I was not receiving a signal. This is in marked 
contrast to the recording I have from a few days ago when I get sensible pm 
and f readings even when there is no readability.

I will be away from Thursday for ten days, but will try to record Valerio tonight 
and Larry in the small hours of the morning. Is there a way to make recording 
on a timer - I don't think that Cool Edit will do this?

After I return from holiday, I will do further work on WOLF. I am gradually 
getting to know what the data readouts mean, and how to recognise when I am 
nearly decoding a signal. I am still not convinced I have -r correct but attempts 
to set it by scientific means have all produced poorer results than by trial and 
error.

As a further suggestion to the software kings, having a few seconds of 
unmodulated carrier built into the transmission every now and again would 
help the receive station to determine whether a signal is present (using a 
spectrogram). Now, I can't tell the difference between poor readability and no 
signal.


Mike, G3XDV (IO91VT)
http://www.lf.thersgb.net